The old observatory in Copenhagen has a spiral corridor used as a racetrack.

This natural hill rose another 130 feet from the debris and rubble added after World War II.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

This sublime architectural marvel is a rare example of an expressionist church.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

Once the home of a hermetic monk, this cave now houses a small church.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.